Generally speaking, the smaller the battery number, the larger the battery, so from the numerical point of view, 5 is less than 7, which means that the No.5 battery is larger than the No.7 battery.
Size of the 5th battery: the model of the 5th battery is AA or R6, and the dimension ruler has a diameter of 14mm and a height of 50mm；; Differences with 1 battery, No.2 battery, No.3 battery, No.7 battery, etc. It's just that the dimensions are different, but the same point is that they all belong to cylindrical batteries with steel shells.
No.7 battery size: No.7 battery /LR03/AM4 model is AAA battery; Size: diameter10.5mm; ; Height 44.5mm；; The rated voltages of No.5 battery and No.7 battery are both1.5v. In terms of overall size and capacity, No.5 battery is larger.
How to save battery:
1. The sealed original packaging can ensure that the battery is protected from environmental factors (such as moisture). In this way, you will not confuse the new battery with the old battery, and the positive and negative electrodes of the battery will not come into contact with other metals.
2. Batteries of different types or manufacturers may react with each other, resulting in liquid leakage or other damage. If it is a non-rechargeable disposable battery, you can't mix old and new batteries. It's better to put them in different boxes. If you want to put them in the same box, separate them with plastic bags.
In most cases, any cool room without direct sunlight is suitable for storing batteries. Even if the temperature is relatively high, such as 25 degrees Celsius, the annual power loss of the battery is usually small.
4. If the ambient humidity is high, or there is a risk of condensation because it is placed in the refrigerator or for other reasons, then the battery must be placed in a moisture-proof container. Alkaline batteries can be safely stored in a slightly humid environment, and the suitable relative humidity is 35% to 65%.
If the battery is in contact with metal, they may leak electricity. This will quickly drain the battery and generate heat.